I've booted without any simm's using only the 8mo on the HD when I open "about mac" I got 8192ko, system programme using 6777ko left only 1361ko. I booted with one simm 32mo in "about mac" I got 40960ko, system using 39488ko left only 1385ko. I tried 4 different simm's 3 32mo and one 16mo using different slots they were all recognized but everytime I bumped up the memory the system took nearly all of it leaviNg me with very little to work with... THE PLOT THICKENS